Editing 3 (section)

==Engineering==
*The [[triangle]], a [[polygon]] with three [[Edge (geometry)|edges]] and three [[Vertex (geometry)|vertices]], is the most stable physical shape. For this reason it is widely utilized in construction, engineering and design.<ref>"[https://web.archive.org/web/20120412203618/http://www.mathsinthecity.com/sites/most-stable-shape-triangle Most stable shape- triangle]". ''Maths in the city''. Retrieved February 23, 2015.</ref>

===Pseudoscience===
*Three is the symbolic representation for [[Mu (lost continent)|Mu]], [[Augustus Le Plongeon]]'s and [[James Churchward]]'s lost continent.<ref name="Three is for the Lost Continent of Mu">{{cite web |url=http://www.bibliotecapleyades.net/atlantida_mu/contmu/contmu09.htm |title=The Lost Continent of Mu – Symbols, Vignettes, Tableaux and Diagrams |first=James |last=Churchward |year=1931 |access-date=2016-03-15 |work=Biblioteca Pleyades |archive-date=2015-07-18 |archive-url=https://web.archive.org/web/20150718115213/http://www.bibliotecapleyades.net/atlantida_mu/contmu/contmu09.htm |url-status=live }}</ref>